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k in (-oo:+oo)
104/49 = (6/7)*k-k+2 // - (6/7)*k-k+2
k-((6/7)*k)+104/49-2 = 0
(-6/7)*k+k+104/49-2 = 0
1/7*k+6/49 = 0 // - 6/49
1/7*k = -6/49 // : 1/7
k = -6/49/1/7
k = -6/7
k = -6/7
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